What steps will reproduce the problem?
1. importing data with pop_loadxdf introduces data shifts releative to marker
channel for EEG streams with irregular sampling rate
2.
3.
What is the expected output? What do you see instead?
EEG events should follow a given marker at a fixed delay (e.g. N1). Instead the
delay between marker onset and EEG response increases over time.
What version of the product are you using? On what operating system?
The amplifiers we used have a nominal sampling rate of 500. The effective
sampling rates are 499.83 and 500.6.
Please provide any additional information below.
The problem arises when importing data into EEG lab. pop_loadxdf calls
eeg_load_xdf using the nominal_srate by default. This leads to shifts in the
data relative to the marker. If effective-srate< nominal_srate this shift is
negative otherwise positive.
using the effective_rate in eeg_load_xdf instead solves the problem in my case.
Original issue reported on code.google.com by bleichne...@gmail.com on 10 Feb 2014 at 2:05
Original issue reported on code.google.com by
bleichne...@gmail.comon 10 Feb 2014 at 2:05